The references to relapse apply almost certainly to fevers of the shorter periods (synocha or "inflammatory" fever), and not to those cases of enteric fever which did undoubtedly occur in the practice of Guy's Hospital in the same seasons.
Typhoid or Enteric Fever in London, 1826.
The identification of enteric fever and relapsing fever respectively, or the separation of each from typhus, became actual in Britain at one and the same time. I have already said all that seems necessary as to the earlier appearances of relapsing fever on the stage of epidemiological history. This will be the fitting point in the chronology, the third decade of the 19th century, to bring in the question of enteric or typhoid fever. As to its identification, or recognition as a distinct species, that was not really completed, to the satisfaction of everyone, until the elaborate analysis of the symptoms respectively of typhus and enteric fevers by Sir William Jenner in 1849-51[345]. But, for ten years before that, the co-existence with maculated typhus of a different long-period fever, having abdominal symptoms and abdominal lesion, had been recognised, and the characteristic ulceration or sloughing of the lymph-follicles of the ileum, with sphacelation of the mesenteric lymph-glands, had been clearly described by several London physicians and depicted in coloured plates, in the years 1826 and 1827, during an unusual prevalence of such cases in London. The authentic history of enteric fever in Britain really begins with these writings by physicians of St George's and Guy's Hospitals. But, as it is improbable that the type of fever was absolutely new in the years 1825 and 1826, it may be asked whether the enteric type cannot be discovered in the old accounts of British fevers, and if so, whether we may assume in the past as much enteric fever relatively to spotted typhus, relapsing fever, or simple continued fever, as in the period after 1850.
Having adverted to this point from time to time in the preceding history as it arose, for example in connexion with Willis's fever of 1661, Strother's fever of 1727-29, the Rouen fever of 1750, and other instances both in children (remittent or convulsive or comatose fever of children) and in adults, I shall not recapitulate farther back than the beginning of the 19th century.